Snatch block



Nov.v 19, 1929. AN. M. ER-DAlf-ll.

SNATCH BLOCK Filed Dec. 29. 1927 adapted lto co-operate Patented Nov. 19, 1929Y COMPANY, 0F EDGERTON, WISCONSIN, A CORPORATION OFjWlSCONSIN SNATCH BLOCK Application aieareeember 29,' 1927. 'serieu No. 243,234.7,r

The invention relates to snatch blocks, and

f has for an object to provide a block of improved construction in which an intermediate portion of a cable may be quickly and easily positioned in or removed from the groove of the sheave at will. A further object is to provide means adapted to normally maintain the cable in engagement with the roove. 1t consists in certain features and e ements of construction, herein shown and described, as indicated by the claim.

In the drawings:

Figure 1 is a face view of the snatch block embodying the present invention.

Figure 2 is a longitudinal sectional view taken substantially at a medial plane.

Figure 3 is a fragmentary sectional view of a modified construction. In the drawing the snatch block is shown as comprising a unitary cast frame, 10, having two side members, 11 and 12, connected together at one end by a bottom portion, 13. A sheave, 14, is mounted between said side members on a bushing, 15, journaled on an inner y bushing, 16, which is loosely mounted on a bolt, 17, journaled in bosses, 11a and 12 of the respective side members and held in place by a castellated nut, 18. The bushing, 15, is preferably of a self-lubricating type, to provide smooth and easy rotation of the sheave.

The upper end of the side member, 12, eX- tends beyond the sheave, forming a curved portion, 20, and terminating in a ring portion, 21; said ring portion being offset so as to be centrally alignedwith a groove, 22, of the sheave, 14. The upper end of the side member, 11, also extends beyond the sheave and terminates in a hook shaped portion, 23, positioned within the plane of the groove, 22, and

with the curved vportion, 20, of the member, 12, to form a curved throat-way, 24, for acable (not shown).

This throat-way, as may be seen from Figure 2, is provided with a m0uth,'25, opening at one side of the block; the other end of said throat-way leading downwardly in substantial registration with the groove, 22, of the V sheave. The width of said curved throat-way is such as to provide a slight force t for- Y the cable, so that any portion of the cable may bequiellyrand easily snapped finto and out of the sheave groove. vWhen the cable is n under tension it will'at all ltimes remain in'l the sheave groove; however, when thel cable 1s sla'ckened, it may tend to raise itself out of said groove, and in this event the slightly restricted, curved. throat-wayafords sutlicient resistance to prevent the cablefreeing itself from the block. Furthermore, if the cable assumes a whipping motionit-will strike eitherA the inside of the hook portion,I 23, or

against the inner wall ofrprojection,-20, and n b e deflected laterally inftheopposite direction. Of course it is understoodl thatitwill be necessary 'that-the tension on the cable", 'A

must be released in order that saidcable may Vbe removed from the block. .v

The side members, 11 and 12, and bottom 13, are reinforced by a pair of integral ribs, 27, extending from said ringportion, 21, outwardly along the marginal edges of the member, 12, and bottom, 13, and upon the'outsidey of the member, 11, to a point about central with the sheave bolt. The ring portion 21, is coupled with a shackle, 28, pivoted to an eye bolt, 29, yfor supporting the block in any convenient position.v This connection is in effect' ticularly adaptable for various rigging appasok ratu's, such as hoisting, cable conveying appa-y readily and frequently or in altering the setup. 'The quick vinsertion and removal lof, a

ratus, and the like, and especiallyv for rigging, Vwhich must be set up and dismantled Y cable from the groove of the sheave, saves con'- siderable timel and inconvenience, vwhich usually accompanies threadingv f ar -cable through thev block.

.Figure 3, illust-rates a mo'diied construc-` tion, in which the upper end `ofthe side member, 11, is recessed at31, for aspringguard member, V32, riveted to said side member.`

T his'spring guard is positioned with its hookf V roo p shaped end, partially registering with the groove, 22, and eo-operating with the curved portion, 20,150 form a restricted throat-Way,

33, considerably narrower than the Cable, so as to permit the Gable to be sprung into and out of the sheave groove.V This spring guard is of sufficient stii'ness to resist the tendencyV of the' cable freeing itself from the block due to Whipping, etc., and normally confine the cable in the groove. Of course the side members and-spring guard may be made integraly 1y of a single pieoeofstoek, benttotheproper shape.` p v Iolaimzp Y A snatch block including a, snbstantially rigid frame consisting of tvvo side members and a sheave mountedffor .rotation between them, one of said members having a portion f extending beyondthe periphery of the sheave andvoiiset-opposite the groove thereof, with afnrther extendingportion formedfor attachmentto a, support in a plane substantial- 1y centralv with respect Vto fthe, sheave, the other side member extending inwardiy adjaeentpthe grooveV of the vsheave andv thence x onrv-ingoutwardly to Cooperate with said offset portion of the iirst mentioned member to forma curved-guidevvay opening at oneside ofthe sheave for 'directing an intermediate p ortiollqof'aJ Cable into the groove of the same, and v.tending to yprevent accidental dislodgmentof thevcabie from the snatohfbloek.

NIGHOLAIM. ERDAHL. 

